The second suspect was arrested Friday, but officials released the information today.

Officials said dozens of teenagers boarded a BART train at the Oakland Coliseum BART Station, and started robbing and beating people. "Thirty kids board my train, beat up someone, robbed them, and then run off the train," a BART operator said.

The mob boarded the train, and terrorized, robbed, and beat passengers for what felt like an eternity.

BART police arrived five minutes after the first call for help because they were busy on a separate suicide call.

By the time they reached the Oakland Coliseum BART Station, the suspects were gone.

The department's top brass is making changes by staffing up, for now. "Most of our officers work four days a week 10-hour shifts. and are going to be working five days a week in a 10-hour shift," BART Police Department acting Dept. Chief Terence McCarty said.